Method and device for explosion forming

• US 8,650,921 B2
• Filed: 08/06/2007
• Issued: 02/18/2014
• Est. Priority Date: 08/11/2006
• Status: Active Grant

• Current Assignee: Cosma Engineering Europe AG
• Original Assignee: Cosma Engineering Europe AG
• Inventors: Stranz, Andreas, Zak, Alexander
• Primary Examiner(s): Kerns, Kevin P
• Assistant Examiner(s): HA, STEVEN S
• Application Number:
  US12/377,198
• Publication Number:
  US 20100175448A1
• Time in Patent Office: 2,388 Days
• Field of Search: 72 54- 63, 724/30, 727/06, 723/423, 723/424, 294/211, 294/212, 102/209, 89/6, 89/65
• US Class Current: 72/56
• CPC Class Codes: B21D 26/08 generated by explosives, e.g. chemical explosives
• CPC Class Codes: B21D 37/16 Heating or cooling
• CPC Class Codes: F42D 3/00 Particular applications of blasting techniques explosive welding B23K20/08; explosive bolts or actuators F42B3/006; explosive valves F16K13/06; cutting devices actuated by explosion B23D15/145; pyrotechnical actuators F15B15/19; switching devices actuated by explosion H01H39/00
• CPC Class Codes: Y10T 29/49806 Explosively shaping

Abstract

With the invention, a method and device for explosive forming of work pieces, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, is to be improved, in that an ignition mechanism that is technically simple to handle, is produced with the shortest possible setup time, which permits the most precise possible ignition of the explosive with time-repeatable accuracy. This task is solved by a method and device, in which at least one work piece is arranged in at least one die and deformed by means of an explosive to be ignited, in which the explosive is ignited by means of induction.

Claims

1. A device (1) for explosive forming comprising:

at least one die (2), in which at least one work piece (5) can be arranged, and an induction element (10), with which an explosive (8) can be ignited in the at least one die (2), wherein the induction element (10) comprises at least one ignition device (11) and at least one coil arrangement (12) as a unit, and wherein said induction element (10), is arranged at least partially in a wall (9) of the at least one die (2) and wherein an inside diameter (26) of the at least one ignition device (11) is about 20 to 40 mm and wherein said at least one ignition device (11) arranged in an explosion chamber (6) of the at least one die (2), in which a voltage can be induced, and wherein the at least one ignition device (11) is configured to ignite an explosive gas mixture.

2. The device (1) according to claim 1, wherein an inside diameter (26) of the at least one ignition device (11) is about 25 to 35 mm.

3. The device (1) according to claim 2, wherein an inside diameter (26) of the at least one ignition device (11) is about 30 mm.

4. A device (1) for explosive forming comprising:

at least one die (2), in which at least one work piece (5) can be arranged, and an induction element (10), with which an explosive (8) can be ignited in the at least one die (2), wherein the induction element (10) comprises at least one ignition device (11) and at least one coil arrangement (12) as a unit, and wherein said induction element (10), is arranged at least partially in a wall (9) of the at least one die (2), wherein said ignition device includes an ignition finger, the coil arrangement (12) is arranged on an area (16) of said ignition finger (13) lying outside of the at least one die (2), and wherein said ignition finger extends through the wall of said at least one die and wherein said at least one coil arrangement (12) for inducing a voltage in said at least one ignition device (11), is arranged outside of an explosion chamber (6) of the at least one die (2).

5. The device (1) according to claim 4, wherein the induction element (10) comprises at least one heating point (28).

6. The device (1) according to claim 5, wherein the at least one heating point (28) extends into the explosion chamber (6).

7. The device (1) according to claim 5, wherein the at least one heating point (28) is arranged approximately flush with the wall (9) of the explosion chamber (6).

8. A device (1) for explosive forming comprising:

at least one die (2), in which at least one work piece (5) can be arranged, and an induction element (10), with which an explosive (8) can be ignited in the at least one die (2), wherein the induction element (10) comprises at least one ignition device (11) and at least one coil arrangement (12) as a unit, and wherein said induction element (10), is arranged at least partially in a wall (9) of the at least one die (2) and wherein the at least one coil arrangement (12) is arranged in approximately annular fashion around an explosion chamber (6) of the at least one die (2).

9. The device (1) according to claim 8, wherein the at least one ignition device (11) comprises tungsten and/or copper.

10. The device (1) according to claim 8, wherein the at least one ignition device (11) is arranged at least in areas extending into the explosion chamber (6).

11. The device (1) according to claim 8, wherein the at least one ignition device (11) is arranged approximately in annular fashion around the explosion chamber (6) of the at least one die (2).

12. The device (1) according to claim 8, wherein the at least one ignition device (11) is arranged approximately flush with the wall (9) of the explosion chamber (6).

13. The device (1) according to claim 8, wherein an inside diameter (26) of the at least one ignition device (11) corresponds approximately to an inside diameter (27) of the explosion chamber (6).

14. The device (1) according to claim 8, wherein the induction element (10) comprises an insulator (19, 21, 31) that insulates the at least one ignition device (11) relative to the at least one die (2).

15. The device (1) according to claim 8, wherein the induction element (10) comprises an insulator (17, 21, 31) that insulates a the at least one coil arrangement (12) relative to the at least one die (2).

16. The device (1) according to claim 8, wherein the induction element (10) comprises a cooling device (43) for cooling said at least one ignition device (11) and said at least one coil arrangement (12).

17. The device (1) according to claim 16, wherein the cooling device (43) comprises water as coolant.

18. The device (1) according to claim 17, wherein the induction element (10) is arranged in a wall (9) of the at least one die (2) and comprises at least one ignition device (11) arranged in the explosion chamber (6) of the at least one die (2), in which a voltage can be induced.

19. The device (1) according to claim 17, wherein the induction element (10) comprises at least one heating point (28).

20. The device (1) according to claim 16, wherein the cooling device (43) comprises nitrogen as coolant.

21. The device (1) according to claim 8, wherein the induction element (10) is arranged with at least one seal (20) in the at least one die (2), which seals the explosion chamber (6) relative to the surroundings.

22. The device (1) according to claim 21, wherein the at least one seal (20) comprises copper.

23. A device (1) for explosive forming comprising:

at least one die (2), in which at least one work piece (5) can be arranged,

an induction element (10), with which an explosive (8) can be ignited in the at least one die (2), and wherein the induction element (10) includes at least one ignition device (11) having a coil arrangement (12), a cooling device (43) and a heating point (28) and wherein the cooling device (43) cools at least one of the at least one ignition device (11) and the coil arrangement (12) and wherein the coil arrangement (12) is arranged in approximately annular fashion around an explosion chamber (6) of the at least one die (2).